diff --git a/power_manager/common/power_constants.h b/power_manager/common/power_constants.h
index 1f20d9c..8bb41a3 100644
--- a/power_manager/common/power_constants.h
+++ b/power_manager/common/power_constants.h
@@ -212,6 +212,8 @@
 // The table is a string containing 6 unsigned integers separated by colon.
 // The first 3 integers are the power table values for clamshell mode, and the
 // later 3 integers are the power table values for tablet mode.
+// These value are the values measured by the Intel wifi power measurement tool,
+// which will be multiplied by 8 before being passed to Intel iwlwifi driver.
 extern const char kIwlWifiTransmitPowerTablePref[];
 
 // Miscellaneous constants.
diff --git a/power_manager/powerd/set_wifi_transmit_power.cc b/power_manager/powerd/set_wifi_transmit_power.cc
index e46e0c9..081d124 100644
--- a/power_manager/powerd/set_wifi_transmit_power.cc
+++ b/power_manager/powerd/set_wifi_transmit_power.cc
@@ -221,15 +221,15 @@
   int group = tablet ? 1 : 0;
 
   err = nla_put_u32(msg, IWL_MVM_VENDOR_ATTR_TXP_LIMIT_24,
-                    values[group * 3 + 0]);
+                    values[group * 3 + 0] * 8);
   CHECK(!err) << "Failed to put MWIFIEX_VENDOR_CMD_ATTR_TXP_LIMIT_24";
 
   err = nla_put_u32(msg, IWL_MVM_VENDOR_ATTR_TXP_LIMIT_52L,
-                    values[group * 3 + 1]);
+                    values[group * 3 + 1] * 8);
   CHECK(!err) << "Failed to put MWIFIEX_VENDOR_CMD_ATTR_TXP_LIMIT_52L";
 
   err = nla_put_u32(msg, IWL_MVM_VENDOR_ATTR_TXP_LIMIT_52H,
-                    values[group * 3 + 2]);
+                    values[group * 3 + 2] * 8);
   CHECK(!err) << "Failed to put MWIFIEX_VENDOR_CMD_ATTR_TXP_LIMIT_52H";
 
   err = nla_nest_end(msg, limits);